



0. L. DOSCH AND M. HEMLEB.

SEWING MACHINE. APPLlcArloN mio mazo. 1916. RENEwED Nov. 4. 191s.

Patented July 22, 1919.

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0. L. DOSCH AND M. HEMLEB. SEWING MACHINE Arme/mou HLED nic. 2u. me. Enzwzn Nov. 4. ma.

1,3 1 1,1 14. Patented July 22, 1919.

2 SHEETS-SHEET 2.

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UN lTEl) STATES PATENT OFFICE.

OLIVER L. DOSCH AND MARTIN HEMLEIB, OF ELIZABETH, NEW JERSEY, ASSIGNORS TD THE SINGER. MANUFACTURING COMPANY, A CORPORATION OF NEW JERSEY.

SEWING-MACHINE.

Application led December 20, 1916, Serial No. 137,946.

To all whom it may concern:

15e it known that we` OLIVER L. Dosen and MAn'riN Hniunnn, citizens of the United States, residing at Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Sewin -Machines, of which the following is a speci cation, reference being had therein to the accompanying drawings.

This invention relates to an improvement in sewing machines, and more particularly to machines so constructed that a driving motor may be embodied as one of the units of its organism.

The invention has for one of its objects to provide a sewing machine with a motor extending into its frame to insure compactness and protection against disarrangement of its parts. It has for other objects to provide such a motor capable of easy removal for access to its parts or for repair without dismantling or renderin operative; also to provi e means whereby the machine may be operated by hand, foot or motor drive; and also to provide for the coupling and uncoupling of the various driving means and the operative parts of the sewing mechanism to permit of the use of the driving means independently of the stitch-forming devices for certain operations, such as the winding of bobbins, the sharpening of needles &c.

In its referred embodiment, the sewing machine is constructed with the usual form of frame comprisin a bed-plate from which rises a hollow stan ard sustaining the overhanging tubular frame member inwhich is journaled the main-shaft having usual or suitable connections with a reciprocating needle. Coperating with the needle is a suitable loop-taking element below the bedplate which has operative connections beneath the latter and through the hollow standard with the main-shaft. r

The main-shaft ispreferably formed in forward and rearward sections, the former which drives the needle being journaled in spaced bearings within the tubular arm of the frame and the latter section bein journaled within a bearing at the u per en of the standard ands aced from tllie adjacent bearing of the tu ular arm; provision being made for coupling and nncoupling these main-shaft sections.

Specification of Letters Patent.

the machine in- Patented July 22, 1919.

Renewed November 4. 1918. Serial No. 261,149.

The rearward main-shaft section has secured thereon externally of the machine frame a driving pulley to receive a belt .from the band-wheel of a treadle mechanism, and adJacent the saine a connection with a crankoperated hand-driving device with means for throwing it into and out of driving relation therewith.

The machine frame is preferably formed at the junction of the standard an d the overhanging arm with an aperture or opening surrounded by a scat to which is fitted the cylindrical rim of an electric motor-frame which is provided with suitable means for removably securing it in position. The driving connection between the motor-shaft and the rearward main-shaft section of the inachine is of such a nature that operative relation between said shafts is established by the mere act of insertion of the motor-unit in the aperture or opening in the sewing machine frame. The motor comprises preferably a stationary field or stator surrounding a rotary armature or rotor which is mounted upon a shaft carrying an angular gear meshing with a similar gear loosely mounted upon the rearward section of the main-shaft. A one-way-acting clutch is preferably provided between the loosely mounted angular gear and its sustaining shaft section whereby its rotation in one direction causes the rotation of the shaft while the rotation of the shaft in the same direction by other driving means permits `the gear and the connected motor armature to remain idle.

It is desirable that the motor be applied to the bracket-arm and intermediate the stitch-forming mechanism* at one end and the balance-wheel at the opposite end lchereof, and that it be housed as far as possible within the bracket-arm, not only to insure eompactness and attractiveness of appearance of the machine as a whole but to permit of its being applied to a well-known form of drop-head treadle-stand in which the capacity of the receptacle for the sewing machine frame is necessarily limited. It is also desirable that the sewing machine structure and the motor may be of such character that the sewing machine may be initially equipped with the `rnc-tor or may be furnished with a motor at any timesubsequently' that such equipment may be desired without reconstruction or special fitting. To this end, it is one of the characteristic features of the present improvement that the niotor is so constructed and arranged that its armatureor power-shaft 1s disposed transversely ol the main-shaft or, at any rate, is directed to one side of the stitch-forming mechanism as distinguished from constructions in which the motor-shaft is arranged in. alinement with the main-shaft of the sewing machine and is therefore d1- rected toward the stitch forming mechansm.

Another important characteristic of the invention is the provision of a readily detachable motor unit applied to the gooseneck of the sewing machine frame and received, at least partially, within a recess in said frame so as to secure as fai" as possible the compactness and attractive appearance of a built in construction, without sacrifice of the feature of ready detachability of the motor.

In the accompanying drawings, Figure 1 is a front sideV elevation, partly in section, representing a sewing machine embodying the present invention, and Fig. 2 a rear end elevation of the same, partly in transverse section. Fig. 3 is a perspectiveV view, partly in section, of the motor detached from the machine, Fig. 4 is al perspective view representing the rearward section and a part of tliie forward section of the main-shaft of the machine with one of they angular gears by which it is connected with the motor armature shaft, and Fig. 5 a similar view of the coupling element for the main-shaft sections.` Fig. 6 is a partial sectional view of the frame, showing a substantially flat cover-plate employed when the motor is not applied to the machine. Fig. 7 is a perspective view of the housing for the handactuated driving` gear.

As represented in the drawings, the machine is constructed with ai frame of Wellknown ferm comprising the bed-plate 1 from which rises the goose-neck comprising the hollow bracket-erin standard 2 and tubular arm Evin the head 4 of which is journaled the reciprocatingV needle-bar 5 carrying the yneedlle 6. The tubular arm 3 is provided with the longitudinally spaced bearing bushings 7 and 8 in which is journaled the forward or needle-actuatin shaft-section 9 of tletwospart main-sha t 9, 10, the latter section ofwhfich `is tubular, being disposed iny allinement with theV former and Journaled in turn within a suitablebearing boss 11` disposed at the upper end of the standard 2 and spaced from the bearing bushing` 8.

The needle-baAr-derives its operative movements from a crank-and-pitman connection with the forward end of the shaft section 9 in a manner'well-known. The needle 6 ceL operates in the production of stitches with a rotary loop-taker 12 mounted beneath the lied-plate upon the upper end oi the vertical loop-taker shaft 13 which carries upon its lower end the beveled pinion 14. meshing with a larger bevel gear 15 upon the 'forward end of the rotary shaft 16 mounted in bearings 17 depending from the bed-plate. The rearward portion of the shaft 16 is connected by means of the inftermes'hing bevel gears 18 and 19 with the intermediate shaft 20 extending upwardly through the standard 2 and connected by means of the bevel gears 21 and 22 with the main-shaft section f). The gear-connected shafts 9, 20, 1G `and 13, thus constitute actuating mechanism interconnecting the needle 6 and loop-taker 12 and insuring their cooperation in properly timed relation.

The rearward or driving section 10` of the main-shaft is loosely surrounded by a bushing 23 affording one member of an anti-friction bearing and having in its opposite ends annular raceways to receive the series of anti-friction balls 24. One series of these balls is confined in its respective raiceway by means of a collar 25 affording a complemental raceway and the other series is conlined within its respective raceway by a collar 26 secured upon said shaft by means of the set-screw 27 and grooved in its inner end to afford a compleinental raceway to the opposed raeeway of the bushing.

The adjacent ends of the shaft sections S) and 10 are shown formed with transverse slots 28 and 29 respectively, to receive the coupling key-plate 30 secured by means of the cross-pin 31 in a transverse slot at the end of the coupling rod 32 passing through the bore of the shaft section 10 and carrying upon its opposite end the button 33. The shaft-section. 9 may, of course,` be regarded as an actuating shaft for the stitchforming mechanism, and the tubular shaftseetion I() may be regarded as a second shaft adapted to be operatively connected with and disconnected from the actuating shaft at the will of the operator.

The rearward end of the tubular shaft sectiony 10 has secured thereon exterior to the mac "ne frame by means of the set-screw 34 the hub 35 of a balance-wheel 36 formed with the integral ooved belt-wheel 37 which is shown ein raced by the driving belt 38 from a soilree of power, such as the band-wheel of a` treadle device.

The fixed collar 26 forms the hub of a gear 26 having peripheral teeth adapted to Ines'li` with those of a larger drivingI gear 39 whose hub 40` is journaled upon the shoulderedl stud-screw 41 tapped into the standard 2. The outer portlon of the hub 40 is formed with a cavityladapted to receive the head of the stud-screw 41 and threaded in its outer end to fitv the correspondingly threaded outer portidn of a screw-plug 42 upon the hub of a crank-arm 43 carrying at its outer end the handle 44.

When the hand driving-attachment thus formed is not in use, the crank 43 and its screw-plug 42 are removed and the driving gear 39 is pressed inwardly out of mesh with the gear 26', the peripheral teeth of the gear 89 restinor against the detaining spring 45 whose o set operative free end enters a peripheral slot 46 in the rim 47 of the segmental gear housing 48 which is formed with an aperture 49 to receive the shouldered stud-screw 41 by which it is secured to the standard 2; the spring 45 having its opposite end secured by the screw 50 to the periphery. of the rim 47. To adjust the hand-driving device for operation, the plug 42 is screwed into the socket of the hub 40, and its engagement with the head of the stud-screw 41 causes the driving gear 39 to be drawn outwardly into mesh with the gear 26, in which position of the parts the hub of the crank 43 becomes seated upon the end of the hub 40, so that the continued turnin of the crank causes the driving of the sha t section 10 through the intermeshing gears 26 and 39.

The goose-neck of the machine frame is formed at the junction of the standard 2 and the tubular arm 3 with an aperture or opening 51 whose inner wall forms an annular Seat to which is litted the annular bearing rib 52 of the motor unit illustrated in Fig. The motor-unit is constructed separately from the sewing machine frame and com prises a stator 53 which is represented as cup-shaped tol afford in its outer or rearward side a cavity to receive the armature or rotor 54 and the surrounding series of coils 55 forming a part of the stator sustained by the laminated portion 56 of the stator-frame.

The stator-frame is provided upon its opposite face with the axially extending armature-shaft bearing-boss 57 formed i'ntermediate its ends with the open-topped gear-cavity 58. The boss 57` is preferably provided with bushings 59 in which the armature-shaft is journaled. The hub 57 is suitably apertured to receive thimbles 60 containing the usual spring-pressed brushes 61 in the form of carbon pencils whose outer ends rest upon the adjacent face of the commutator 62 sustained at the inner end of the armature. The usual connection between the source of current supply and the brushes and the field coils, respectively,y is made by means of the insulated wires 63 extending through the standard 2 and through the opening 64 in the bottom of the statorframe.

The armature-shaft 65 has fixed thereon within the cavity 58 the angular or spiral gear 66 meshing with the larger angular gear '67tted loosely upon the main-shaft lsection l0. The inlermeshing spiral gears 66 and 67 thus constitute positive!)y r:Ming smooth and quiet running speed--rednring means which permits of the employment olA a motor running normally at high speed and therefore of minimum dimensions for the power to be developed; and this in turn facilitates the partial reception of the motor unit within the recessed goose-neck se as to afford com actness of the consti-mation as well as a high` efficiency and the attrmtire appearance of a built-in construction.

The inner or hub portion of the gear (37 is formed with an eccentrically disposed clutch-cavity 68 merging at one end into iis bore and embracing within the same the clutch-roller 69 pressed normally toward the open end of the cavity by means of the spring 70 in a manner well known. The gear 67 is confined against the collar 25 of its supporting shaft section and the clutch roller 69 and its spring are retained wii hin their cavity 68 by means of the collar 71 secured upon the shaft section 10 by means of the set-screw 72. The clutch connection be tween the stitch-forming mechanism and ihe motor, afforded by the clutch-roll 69 and lhe walls of the clutch-cavity 68, acts automa tically to disconnect the motor from the siitrhforming mechanism when the latter is driven by handor foot-power.

When the sewing machine is in operative position upon its supporting table, the inner disk-shaped face of the motor-frame affords an effective barrier between the operative parts of the sewing machine and the motorarmature and field to effectively exclude from the latter any oil and dirt that may be thrown off by the moving parts of thel sewing machine within the hollow frame. To afford proper lubrication for the gears and 67, the cavity 58 is preferably partially filled with oil which in the operative position of the machine frame is confined therein to prevent undesirable spreading. To suit ably confine the contained oil when the inachine is turned sidewise for any purpose, as for adjustment of parts beneath the bedplate, the inner face of the motor-frame is formed with a U-sha ed rib 73 extending from opposite sides o the cavity 58 so tha t the overflow of oil from the latter when 'the bearing boss 57 becomes backwardly inclined will be caught temporarily in the pocket thus formed, to be returned to the cavity 58 when the machine frame resumes normal operative osition.

When t e machine is' applied to a drophead cabinet of well-known form, below the top of which it is turned forwardly and downwardly when not in use, the oil from the gear-cavity 58 is received in two or more pockets 74 (Fig. 3) extending inwardly from such cavity, the oil thus caught being returned to the gear-cavity when the machine is next righted for a sewing operation.

At opposite sides of the gear (16, the bear ing boss 57 is shown provided with the dependingl oil-cups 7 5 adapted to be screwed into threaded sockets 76 communicating with the bores of the bushings 59 in a manner Well known. Needless to say, the motor shaft 65, beinlg1 disposed horizontally, may be more etliciently lubricated than a vertically disposed motor-shaft.

As lthus described, the motor constitutes a separate and distinct unit of the sewing machine which may be secured in place by a single fastening scren7 77 passing through the standard 2 and entering an aperture 7S in the end of the boss 57; and the motor may be removed Without in any Wise dismantling or disarranging the operative parts of the sewing machine by merely removing the screw 77 or such other fastening means as may be provided.

As represented in Fig. 2, the m'otor is preferably inc-used Within a. cap 79 having a rim fitted to the motor-aperture 51 of the machine frame; but in case it should be de-` sired to furnish the machine unequipped With a motor drive, a flat cover-plate 80' (Fig. 6) may be employed in lieu of the cylindrical cap 79.

The foregoing features are of prime importance inasmuch as the machine may be sold as a neat appearing tread'leor handoperated machine with the cover-plate 8O applied to the aperture 51 and devoid ot unsightly external attachments, brackets or the. like. Later on, if the user desires to avail himself of the motor-drive, a motornnit may be purchased and readily fitted to the recessed goose-neck or, in the embodiment shown, inserted in the aperture 51 in lieu of the cover-plate 80. The services of a skilled mechanic are not required to effect the change from manual, i. e., handor footpower drive, to mot0r-drive. In the present embodiment of the invention the mere act of insertion of the motor in the opening or aperture 51 establishes operative relation between the gears 66 and 67, thus connectin the motor to the machine. It will be note that the gear 67 is mounted on the shaft 10` which may be considered as Va part of the manual drive inasmuch as power from the belt 38 or hand-crank 43 is transmitted to the stitch-forming mechanism through the shaft 10.

From the foregoing description it will be observed that the three diilierent drives With which the machine is equipped are a applied to what is herein termed the driving main-shaft section which is normally coupled to the driven main-shaft section by means of the keyplate 30 entering the slot 28 of the driven shaft section; and that any one 0f these different drives may be operated in the Winding of bobbins or other operations uhconneeted with .sewing4 by the mere retraction of the rod 32 to withdraw the ke -pla-te 30 from the slot 28, thus manually 1e easing the stitch-forming mechanism from the motor and other drives. It is further to be noted that, While the treadle-actuated driving pulley 37 is fixed upon the driving section 10 of the main-shaft; the hand attachment is disengageahle from such section hy lateral shift of the driving fgear 39 and that the motor drive connection is rendered ineffective in the mere turning of the driving shaft section by either of the manual drives. It is thus evident that each of these drives is operable independently of the others.

While the balance-wheel 36 is caused to rotate idly when the motor is in action, it will be observed that, although the motor may cause the machine to stop in a disadvantageous position of the needle the operator is free to manuallypturn the main-shaft by the use of the balance-Wheel to adjust the needle to any desired position, either at its highest point for introduction or removal of the work or at a low-er position to enable the needle to serve as a pivot on which to revolve the werk in turning a corner olf a seam.

While the present improvement is shown herein in what is deemed a preferable form, it is to be understood that the same is susceptible of very material modification in the construction and arrangement of its parts Within the scope of the invention, and that the type of motor employed is not essential, although an electric motor is preferable because of the ease with which it may -be control-led and supplied with the necessary poweranedium for its operation.

Having thus set forth the nature of the invention, what We claim herein is 1. In a sewin machine, in combination, a frame forme4 with an aperture, stitchforming mechanism comprisin a reciproeating needle and complementa loop-taking means incorporated in saidV trame, operating mechanism interconnecting said needle and loop-talting means, a motor-unit comprising a stator detachably supported by said frame, and a rotor journaled in said stator and ineluding a power-shaft entering said aperture and' operatively connected with said operating mechanism.

2. In a sewin machine, in combination, a frame, stitchorming devices and operating mechanism therefor including a shaft, a motor including a stator and a rotor, said? stator being detachably` sustained as a unit by said frame and said rotor havin a powershaft disposed transversely of said s aft, and an operative connection between said shafts.

3. A motor driven sewing machine having a frame formed with a recessed gooseneck, sewing mechanism incorporated in eny said frame, a driving motor received at least partially within the recess of said gooseneck and detacl'ia'ble therefrom as a unit, and a driving connection between said motor andI sewing mechanism.

4. In a sewing machine, in combination, a frame formed with an aperture, stitch-forming devices and operating,- mechanism therefor sustained by said frame, a motor-unit constructed independently of and sustained by said frame and having a power-shaft directed to one side of the stitchforming mechanism and entering said aperture, and a driving connection between said powershaft and said operating mechanism.

5. In a Vsewing machine, a frame having an opening therein, stitch-forming mechanism sustained by said frame, me'ans for actuating said stitch-forming mechanism, and a readily removable actuating unit constructed separately from said frame and entering said opening, said unit having a driving connection operatively conne-ctible with the stitch-forming mechanism by insertion in said opening.

6. In a sewing machine, in combination, a frame including a standard and an overlranging bracket arm, stitchforming devices and operating mechanism therefor incorporated in said frame and including a main-shaft, a motor detachab-ly sustained by said frame independently of said operating mechanism and havingr a power-shaft disposed transversely of saidy standard and first-mentioned shaft, and an operative connection between said shafts.

7. In a sewing machine, in combination, a frame including a standard and an overhanging bracket-arm, a reciprocating needle carried by said bracket-arm, `a complemental loop-taker, actuating mechanism intercoi'inecting said needle and loop-taker and including a needle-actuating shaft carried by `and extending longitudinally of the braclm't-arm, and a driving motor carried by said frame and includingr a power-shaft eX- tendingy transvcrsel of said standard andneedle-actuating s aft, `and an operative connection between said shafts.

8. In a sewing machine, in combination, a frame including a hollow member, stitchforxning devices and operating mechanism therefor carried by said frame'and including a. shaft, a motor sustained by said frame and having a horizontally disposed powershaft extending transversely of said firstmentioned shaft and at least partially within the hollow member of said frame` and an operative connection between said shafts.

9. In a sewing' machine, in combination. a frame formed with an aperture, stitchforming` mechanism comprising;r a reciproeating needle and complemental loop-taking moans incorporated in said frame. operatingY mechanism interconnertiog said needle and loop-taking means, a motor-unit comprising a stator seated Within said aperture and a rotor journaled in said stator and including a power-shaft projecting through said aperture and connected with said operating mechanism.

10. In a sewing machine, in combination, a frame formed with a hollow n'icinber, stitch formin devices mounted in said frame, operating mechanism therefor inelnding a rotary element housed Within the hollow frame-member, and a motor detachably sustained as a unit by said frame and having a power-shaft operatively connected with said element of the operating mechanism within said hollow frame-member.

11. In a sewing machine, in combination, a frame formed with a hollow portion provided with spaced and alined shaft bearings and with a lateral `aperture intermediate the same, stitch-forming devices and operating mechanism therefor including a rotary shaft journaled in said bearings, a motor detachably sustained as a unit by said frame and having a Vpower-shaft entering said aperture, and an operative connection between said shafts intermediate said bearings.

12. I n a sewing machine, in combination, a frame having a standard, stitch-forming mechanism and operating means therefor sustained by the frame, said means including ashaft, and -a motor unit detachab-ly secured to the frame with its axis transverse to said shaft andstandard, and a speed-reducing connection between said motor unit and said stitch-forming mechanism.

13. In a sewing machine, in combination, a; frame having a work-support, overhanging arm and intermediate thin walled standard. said standard being provided with an openingsurrounded b v a seat, stitch-forming mechanism sustained by the frame, means for operating the stitchforming mechanism includingl a shaft, a motor unit having a seat removably fitted to the seat on the standard with its axis transverse the standard and in non-intersecting relation with respect to said shaft, and a reduction gearing between the motor unit and the shaft.

14. In a sewing machine, in combination, a frame formed with an aperture, stitchforming devices and operating mechanism therefor carried by said frame and including a rotary shaft carrying a spiral gear, and a motor sustained by said frame substantially in register with said aperture and having a power-shaft extending transversely of and in non-intersectingfI relation with said rotarl shaft, said power-shaft carrying a spiraiI ear disposed in intermeshing relation with the spiral gear on said rotary shaft.

l5. In a sewing machine, in combination,

a frame, stitch-forming devices and operating mechanism therefor including a rotary shaft, a motor sustained by said frame and iavimr a power-sl1aft disposed transversely of and in non-intersecting relation with said rotary shaft, and an operative connection between said shafts comprising a worm fixed to said power-shaft and a gear meshing with said worm and mounted on said rotary shaft lto transmit rotary movement from the power-shaft to the said rotary shaft at a reduced speed.

16. In combination, a sewing machine frame having a hollow portion formed with a lateral aperture, stitchforming devices and operating mechanism therefor including a rotary element extending within the hollow frame member, and an electric mo tor comprising a cup-shaped frame having its body fitted within said aperture to afford a closure therefor within said hollow frame portion and provided with an inwardly eX- tending bearing boss, and a power-shaft journaled in said bearing boss and operatively connected adjacent the same with said rotary element and sustaining upon its outer end portion an armature disposed within the cavity afforded by the cup-shaped motor frame.

17. In a sewing machine, in combination, a frame formed with a hollow member having a lateral aperture, stitch-forming devices and operating mechanism therefor including a rotar element within the hollow frame mem er, a motor detachably sustained by said frame and extending through said aperture and partially housed within the frame, said motor comprising a' powershaft operatively connected with said rotary element, and a hollow cover of less depth than that of said motor for housing that portion of the latter disposed outside of said frame.

18. In a sewing machine, in combination, a frame formed with a hollow member having a lateral aperture, stitch-forming devices and operatin mechanism therefor including a rotary elgement within the hollow frame member, a motor disposed partially exterior to and detachably sustained by said frame in register with said aperture with its shaft operatively connected with said rotary element, and a cover applied to said aperture lfor housing that portion of the motor outside of said frame.

19. In a sewinv machine, in combination, a frame formed, with a hollow portion, stitch-forming devices and operating meehanism therefor yincluding a rotary element housed within 'the hollow frame portion, a motor-unit comprising a stator dletachabiy sustained by said frame and a rotor havin a power-shaft journaled in said stator and operatively connected with said element of the operating mechanism within said hollow frame portion, and a positively acting coupling device whereb the motor may be caused to actuate t e stitch-forming devices or to operate independently thereof.

Q0. In a sewing machine, in combination,

stitch-forming mechanism including a reciprocating needle, a loop-taker an inter- 21. In a sewing machine, a plurality of main-shaft sections, stitch-forming means actuated by one of said shaft-sections, a plurality of actuating means each adapted for independent connection with or disconnection from another of said shaft-sections, and means for connecting and disconnecting said ser-tions at will.

22. In a sewing machine, in combination, stitch-formingr mechanism, operating means therefor including a rotary shaft formed in separate drivi and driven sections, an operative connection between the driven shaft section and the stitch-forming mechanism, manual driving means connected with the driving shaft section, a motor unit also oonnected with said driving shaft section, and means for coupling and uncoupling said sha ft sections.

23. In a sewing machine, in combination, stitch forming mechanism, an actuating shaft therefor, a plurality of driving devices including a motor and a belt pulley, and means for transmitting power to said actuating shaft from either of said driving devices including a driving element common to both.

24. In a sewing machine, in combination, stitch forming mechanism, an actuating shaft therefor, a second shaft ada ted Ato be operatively connected with and isconnected from said actuating shaft, and a plurality of differentially movable driving devices adapted to drive said actuating shaft through the medium of said second shaft.

In a sewing machine, in combination, stitch-forming mechanism, a sectional mainshaft, a plurality of differentially movable main-shaft driving devices, and means for operatively controlling the connection between said shaft-sections for effecting and discontinuing the transmission of power` to meet the requirements of operating `conditions.

26. In a sewinfg machine, in combination, a frame, stitchorming devices, operating means therefor includin a rotary shaft formed in end-to-end driving and. driven sections of which the latter is operatively connected with the stitch-forming devices,

a motor operatively connected with the driving shaft-section, additional manually actuated drivinir means also applied to said driving shaft-section, and a coupling device foiI operatively connecting and disconnectingl said shaft-sections and provided with controlling means operable from the end of the driving shaft-section opposite said coupling means,

27. In a sewing machine, in coii'ibination, a fai'ne, stitch-formin devices, operating means therefor including a rotary shaft formed in end-to-end driving and driven sections of which the latter is operatively connected with the stitch-forming devices, a motor operatively connected with the driving shaft-section, additional manually actuated driving means also applied to said driving shait-section,` and a coupling device for operatively connecting and disconnecting said shaft-sections.

28. In a sewing machine, in combination, a frame, stitch-forming devices, operating means therefor incliidin a' rotary shaft formed in end-to-end driving and driven sections of which the latter is operatively connected with the stitch-forming devices, a balance-Wheel sustained by and connected to rotate with the driven shaft-section, a motor sustained by said frame, an o erative connection between said motor and t e driving shafft-secti on including a one-Way-acting clutch for permitting such shaft-section to be turned forwardly independently of the motor, and a coupling device for operatively connecting and disconnecting said shaftsections.

29. In. a sevvin machine, inrombination, a frame, stitchorming devices, operating means therefor including a rotary shaft formed in end -to-end driving and driven sections of which the latter is operatively connected with the stitch-formin devices, a balance-Wheel applied to the driving shaftsections, a hand-operated driving device with means for connecting it to and disconnecting it 4from said drivin shaft-section., a motor sustained lby sai frame, an operative connection between said motor and the driving 'shaft-section including a one-Way-acting `clutch for permitting such shaft-section to be turned forwardly independently of the motor, and a coupling device for operatively connecting and disconnecting said shaft-sections.

30. In a sewing machine, in combination, a frame, stitch-formin"` devices and operating mechanism there or mounted within said frame, a driving ivheel connected with said mechanism and disposed exterior to said frame, a motor detafchablv sustained as a unit by said frame and having a powershaft disposed partially exterior to said frame and extending into 1the latter, and a driving connection between said gwen shaft and said operating mechanism intermediate said stitch-forming devices and the driving wheel.

31. In a sewing machine, in conil'iination. a frame, a reciprocating needle and compleinental loop-taking means incorporated in said frame, interconnecting mechanism for actuating the needle and loolji-taking means` iii properly timed relation to one another, a rotary element distinct from said interconnecting mechanism and joiirnaled in said frame, :i belt-Wheel carried by said element, an electric motor for driving said clement, and means for establishing and interrupting driving relation between said clement and said interconnecting mechanism, whereby said belt-wheel may be driven independently of said interconnecting mechanism.

32. Ina sewing machine, iiicombinatioina frame, a reciprocating needle and complementa] loop-taking means incorporated in said frame, interconnecting mechanism for actuating the needle and loop-taking means in properly timed relation to one another, a belt-Wheel mounted for rotation independently 0f said interconnecting mechanism, an electric mot-or for driving said belt-wheel, means for establishing and interrupting driving relation between said belt-wheel and said interconnecting mechanism, and a oneivay acting clutch between said motor and belt-Wheel.

33. In a sewing machine, in combination, stitehforming mechanism, a supporting framework, an actuating shaft, a plurality of differentially movable driving devices supported by said framework, and a disconnectible connection common to said drivingl devices and disposed between said driving devices and said actuating `shaft.

34. Iii a sewing machine, in combination, stitch-forming' mechanism including a reciprocating needle and a loop-taker, operating mechanism interconnecting said needle and loo taker, manual drivin means connected Witlii said Operating mec iaiiism, a detachable motor unit disposed between said op erating mechanism and said manual driving means, and a one-way driving connection hctvveen said motor unit andvsaid operating mechanism whereby the stitchfoi-ming mechanism may be actuated by said motor or independently thereof by said manual drivin means.

35. n a sewing machine, a frame, stitchforniing mechanism carried by said frame, electro-magnetic means detachably mounted in said frame for driving said stitch-forming mechanism, means for manually driving said stitch-forming mechanism, means for disconnecting either of said driving mean: from said stitch-forming mechanism, and separate means for disconnecting both of said driving means from said stitrh-forming mechanism,

36. In a sewin machine, a frame having an opening, stitc forming mechanism carried by said frame, manual means for actuating said stitch-forming mechanism, a readily detachable motor constructed separately from said frame and adapted to enter said opening, and coperating driving conne@ tions carried by said motor and manual actuating means which arc hrou ht into operi tivo relation upon insertion o A said motor in said opening.

37. In a sewing machine, stitch-forming mechanism, a shaft, means for connecting said shaft to the stitch-forming mechanism at will, motor means for driving said shaft, means for manually driving said shaft, and means for automatically releasing said motor drive means when the shaft is manually driven.

38. In a sewingr machine, stitch-forming mechanism, a plurality of actuating means therefor, a plurality of means for individually releasing said actuating means from said stitch-forming mechanism, and common means for releasing all of said actuating means from said stitch-forming mechanism.

39. In a sewing machine, in combination, a mainshaft, a plurality of drivin devices comprising a motor drive, a beltrive and hand drive independent of each other, and means for actuating said shaft from any one of said devices.

40. In a sewing machine, in combination, stitch-forming mechanism, a rotary shaft, belt-driven actuating means for said shaft, hand-operated actuating means detachably connected with said shaft, and a detachable motor-unit also connected with said shaft independently of the belt-driven and hand-operated actuating means.

41. In a sewing machine, in combination, stitch-forming mechanism, a rotary shaft, belt-driven actuating means for said shaft, hand-operated actuatin means detachably connected with said sha t, a motor unit, and a clutch connection between said motor unit and the stitch-forming mechanism whereby the motor may remain at rest durin theI use of the belt-driven or hand-operate actuating means.

42. In a sewing machine, in combination, a frame, stitch-forming devices carried thereby, operating means connecting said devices, a belt-wheel connected to said operating means, a hand-operated driving device with means for connecting it to and disconnecting it from said operating means, a motorun1t sustained by said frame, and an operative connection between said motorunit and said operating means.

43'. In a sewing machine, in combination a frame, stitch-forming devices carrie thereby, operating means connectin said devices, a belt-wheel connected to sai o erating means, a hand-operated driving evice sans@ with means for connecting it to and disconnecting it from said operating means, a motor-unit sustained by said frame, and an operative connection between said motorunit and said `operating means, said lastnientioned connection includin a one-way acting clutch for permitting said operating means to be turned forwardly independently of the motor.

44. In a sewing machine, in combination, a frame including a standard and an overhanging ,bracket-arm, stitch-forming devices carried by said frame, operating means connecting said devices, a b t-wl1eel mounted at the'side of said` stan ard o gposite the bracket-arm and connected to sai operating means, a hand-operated driving device disposed below said belt-wheel with means for connecting it with and disconnecting it from sai operating means, a motor sustained by said frame at the rear of said standard, and an operative connection between said motor and said operating means.

45. In combination, a sewing machine frame,.stitch-forming devices and operating means therefor including a rotary shaft eX- -tending -lengthwise vof said frame, and a motor mounted upon the machine frame and comprising a frame .constructed with alined shaft bearings extending crosswise of the Ina-chine frame and having an intermediate open-topped gear cavity and an oil pocket extendingfrom the same lengthwise of one oif said shaft bearings to catch lubricant overflowing from said cavity when the machine frame is canted laterally, and a power-shaft journaled in said bearings and carrying `a gear entering said cavity and operatively connected with said rotary shaft.

46. In combination, a sewing machine frame, stitch-forming devices and operating means therefor including a rotary shaft eX- tending lengthwise of said frame, and a motor mounted upon the machine frame and comprising a frame constructed with alined shaft bearings extending crosswise of the machine frame and having an intermediate open-topped gearfcavity and oil-pockets extending oppositely Ifrom the same and lengthwise of said shaft bearings to catch lubricant overflowing from said cavity when the ymachine frame is canted laterally in either direction, and a power-shaft Journaled in said bearings and carrying a gear entering said cavity and operatively connected with said rotary shaft.

47. In combination, a sewing machine frame, stitch-formin devices and operatin means therefor incliding a rotary sha t extending lengthwise of said frame, and a motor mounts upon the machine frame and comprising a frame constructed with alined shaft bearings extending crosswise of the machine frame and having an intermediate open-topped gear-cavity, a U-shaped rib being formed upon the top of one of said bearings to afford a lubricant-overflow receptacle at one side of said cavity, and pockets being formed in the wall of and at the opposite side of said receptacle to receive overiow lubricant at the corresponding side of said cavity, and a power-shaft journaled in said bearings and carrying a gear enterin said cavity and operatively connected wit said rotary shaft.

48. A sewing machine comprisinga frame, a reciprocating needle, a complemental looptaker, and interconnecting mechanism for driving said needle and loop-taker in proper1 timed relation, all carried by said frame, a riving shaft additional to said interconnecting mechanism and journaled in said frame, a belt-driven balance-Wheel carried by said driving shaft, and means for establishing and interrupting driving relation between said driving shaft and said interconnectin mechanism, said frame bein formed wlth a seat adapted for reception o a motor-unit in drivin relation with said shaft when it is desire to o erate the machine by power applied in ependently of the balance-wheel.

In testimony whereof we have signed our names to this specification.

OLIVER L. DOSCH. MARTIN HEMLEB.

copies of this patent may be obtained for ilve cents each, by addressing the "Commissioner oi Patents, Washington, D. 0. 

